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Answers and rating deltas for

Why does this regex check return true for this string?

Author Votes Δ
Koraktor 4 +4.07
Ben 2 +1.52
Toto 2 +0.95
giraff 1 -0.59
a'r 0 -0.69
Phrogz 0 -0.88
Last visited: Sep 14, 2014, 5:07:29 AM